Help with Rendering for SV? ^^

Uhm could someone please help me out with rendering properties on Sony Vegas for good HD quality on YouTube? :3

I'd like to know what format it will be in (.wmv or .mp4), how long it takes to render, and how big the file size will be after it has finished rendering ^^ I usually do 720p HD since 1080p HD is going to be like a very big file o-o;